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BBC R&D White Paper WHP056

DTT Comparison of 64QAM(2/3) with 16QAM(3/4):
Co-channel Interference from PAL, Echoes and Impulsive Interference
John Salter and José Lago-Fernández

Keywords
DVB-T, multipath, noise bucket, END, OFDM

Abstract
This white paper collates results comparing the performance of the two DVB-T modes currently in use in the UK. Namely, 64 QAM rate 2/3 and 16 QAM rate 3/4, both using 2K carriers with a 7 ms guard interval. Three different sources of impairment are measured: Co-channel interference from an analogue PAL signal, multipath propagation resulting in one echo inside or outside the guard interval and impulsive interference. Results are presented in a novel manner as 'noise bucket' plots. These plots are used to quantify the improvement in performance that can be achieved with 16 QAM rate 3/4 over 64 QAM rate 2/3.